sy-subrc=4 when connect to external SQL DB

Hi experts,

I want to connect to external SQL database from SAP with HANA database. And i done the config by tcode: DBCO like below:

And below is the test connection program

CONSTANTS:cn_sql_conn_name TYPE dbcon-con_name

                                        VALUE 'ZHR_PT_TX_DB_CONNECTION'.

EXEC SQL.

   CONNECT TO :cn_sql_conn_name

ENDEXEC.

IF sy-subrc <> 0.

ENDIF.

And sy-subrc = 4 when a run this code. Then I searched on the internet and found it maybe caused less of dbmssslib.<ext> file.

But i use tcode: AL11 to check the file existed in system,

and still cannot connect to the external SQL database.

But when i did the same thing in SAP IDS system based on non-HANA dabase, it connected to SQL db successfully.

Did anybody met this issue before??